US9157184B2 - Industrial roll with triggering system for sensors for operational parameters - Google Patents
Industrial roll with triggering system for sensors for operational parameters Download PDFInfo
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- US9157184B2 US9157184B2 US14/255,734 US201414255734A US9157184B2 US 9157184 B2 US9157184 B2 US 9157184B2 US 201414255734 A US201414255734 A US 201414255734A US 9157184 B2 US9157184 B2 US 9157184B2
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- United States
- Prior art keywords
- roll
- gravity vector
- trigger
- sensors
- magnitude
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/04—Arrangements thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/06—Means for regulating the pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/28—Arrangements for preventing distortion of, or damage to, presses or parts thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B3/00—Presses characterised by the use of rotary pressing members, e.g. rollers, rings, discs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B3/00—Presses characterised by the use of rotary pressing members, e.g. rollers, rings, discs
- B30B3/04—Presses characterised by the use of rotary pressing members, e.g. rollers, rings, discs co-operating with one another, e.g. with co-operating cones
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/08—Pressure rolls
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/0009—Paper-making control systems
- D21G9/0036—Paper-making control systems controlling the press or drying section
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/0009—Paper-making control systems
- D21G9/0045—Paper-making control systems controlling the calendering or finishing
Definitions
- the present invention relates generally to industrial rolls, and more particularly to rolls for papermaking.
- a water slurry, or suspension, of cellulosic fibers (known as the paper “stock”) is fed onto the top of the upper run of an endless belt of woven wire and/or synthetic material that travels between two or more rolls.
- the belt often referred to as a “forming fabric,” provides a papermaking surface on the upper surface of its upper run which operates as a filter to separate the cellulosic fibers of the paper stock from the aqueous medium, thereby forming a wet paper web.
- the aqueous medium drains through mesh openings of the forming fabric, known as drainage holes, by gravity or vacuum located on the lower surface of the upper run (i. e., the “machine side”) of the fabric.
- the paper web After leaving the forming section, the paper web is transferred to a press section of the paper machine, where it is passed through the nips of one or more presses (often roller presses) covered with another fabric, typically referred to as a “press felt.” Pressure from the presses removes additional moisture from the web; the moisture removal is often enhanced by the presence of a “batt” layer of the press felt. The paper is then transferred to a dryer section for further moisture removal. After drying, the paper is ready for secondary processing and packaging.
- presses often roller presses
- another fabric typically referred to as a “press felt.”
- Pressure from the presses removes additional moisture from the web; the moisture removal is often enhanced by the presence of a “batt” layer of the press felt.
- the paper is then transferred to a dryer section for further moisture removal. After drying, the paper is ready for secondary processing and packaging.
- Cylindrical rolls are typically utilized in different sections of a papermaking machine, such as the press section. Such rolls reside and operate in demanding environments in which they can be exposed to high dynamic loads and temperatures and aggressive or corrosive chemical agents. As an example, in a typical paper mill, rolls are used not only for transporting the fibrous web sheet between processing stations, but also, in the case of press section and calender rolls, for processing the web sheet itself into paper.
- rolls used in papermaking are constructed with the location within the papermaking machine in mind, as rolls residing in different positions within the papermaking machines are required to perform different functions.
- many papermaking rolls include a polymeric cover that surrounds the circumferential surface of a typically metallic core.
- the cover designer can provide the roll with different performance characteristics as the papermaking application demands.
- repairing, regrinding or replacing a cover over a metallic roll can be considerably less expensive than the replacement of an entire metallic roll.
- Exemplary polymeric materials for covers include natural rubber, synthetic rubbers such as neoprene, styrene-butadiene (SBR), nitrile rubber, chlorosulfonated polyethylene (“CSPE”—also known under the trade name HYPALON from DuPont), EDPM (the name given to an ethylene-propylene terpolymer formed of ethylene-propylene diene monomer), polyurethane, thermoset composites, and thermoplastic composites.
- synthetic rubbers such as neoprene, styrene-butadiene (SBR), nitrile rubber, chlorosulfonated polyethylene (“CSPE”—also known under the trade name HYPALON from DuPont), EDPM (the name given to an ethylene-propylene terpolymer formed of ethylene-propylene diene monomer), polyurethane, thermoset composites, and thermoplastic composites.
- SBR styrene-butadiene
- the roll cover will include at least two distinct layers: a base layer that overlies the core and provides a bond thereto; and a topstock layer that overlies and bonds to the base layer and serves the outer surface of the roll (some rolls will also include an intermediate “tie-in” layer sandwiched by the base and top stock layers).
- the layers for these materials are typically selected to provide the cover with a prescribed set of physical properties for operation. These can include the requisite strength, elastic modulus, and resistance to elevated temperature, water and harsh chemicals to withstand the papermaking environment.
- covers are typically designed to have a predetermined surface hardness that is appropriate for the process they are to perform, and they typically require that the paper sheet “release” from the cover without damage to the paper sheet.
- the cover should be abrasion- and wear-resistant.
- a roll can also be important.
- the stress and strain experienced by the roll cover in the cross machine direction can provide information about the durability and dimensional stability of the cover.
- the temperature profile of the roll can assist in identifying potential problem areas of the cover.
- embodiments of the invention are directed to a method of determining the rotative position of an industrial roll.
- the method comprises the steps of:
- step (c) comparing the magnitude and direction of the gravity vector detected in step (b) to a predetermined pre-trigger gravity vector
- step (d) if the absolute value of the gravity vector detected in (b) has not reached the absolute value of the pre-trigger gravity vector, repeating steps (b) and (c); otherwise, proceeding to step (e);
- step (g) if the absolute value of the magnitude of the gravity vector detected in step (f) reaches the absolute value of the magnitude of the trigger gravity vector, repeating steps (e) and (f); otherwise, proceeding to step (h); and
- step (h) determining the rotative position of the roll based on the gravity vector detected in step (e).
- embodiments of the invention are directed to a method of determining the rotative position of an industrial roll, the method comprising the steps of:
- step (e) matching the data gathered in step (d) with a respective sensor of the plurality of sensors based on the determination of the trigger angular position.
- embodiments of the invention are directed to a system for determining the rotative position of an industrial roll, comprising: an industrial roll having a longitudinal axis; an accelerometer mounted on one end of the industrial roll; a plurality of sensors mounted on the roll, each of the sensors configured to detect an operational parameter; and a processor associated with the plurality of sensors and with the accelerometer.
- the processor is configured to:
- step (d) match the data gathered in step (c) with a respective sensor of the plurality of sensors based on the determination of the trigger angular position.
- FIG. 1 is a front view of an industrial roll with sensors for detecting operational parameters according to embodiments of the present invention.
- FIG. 2 is an end view of an industrial roll having an accelerometer mounted thereon, schematically showing the measured force vector of the accelerometer at different roll positions.
- FIG. 3 is a schematic view of a position-determining system according to embodiments of the invention.
- FIG. 4A is a graph plotting accelerometer force as a function of roll position.
- FIG. 4B is a graph plotting accelerometer force as a function of roll position, wherein exemplary pre-trigger and trigger values are shown according to embodiments of the invention.
- FIG. 5 is a flow diagram of operations according to embodiments of the invention.
- These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function/act specified in the block diagrams and/or flowchart block or blocks.
- the computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions/acts specified in the block diagrams and/or flowchart block or blocks.
- the present invention may be embodied in hardware and/or in software (including firmware, resident software, micro-code, etc.).
- embodiments of the present invention may take the form of a computer program product on a computer-usable or computer-readable non-transient storage medium having computer-usable or computer-readable program code embodied in the medium for use by or in connection with an instruction execution system.
- the computer-usable or computer-readable medium may be a non-transient computer-readable medium, for example but not limited to, an electronic, electromagnetic, or semiconductor system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), and a portable compact disc read-only memory (CD-ROM).
- RAM random access memory
- ROM read-only memory
- EPROM or Flash memory erasable programmable read-only memory
- CD-ROM portable compact disc read-only memory
- FIG. 1 an industrial roll, designated broadly at 20 , is illustrated in FIG. 1 .
- the roll 20 has a longitudinal axis A and includes a hollow cylindrical shell or core 22 (not shown in FIG. 1 ) and a cover 24 (typically formed of one or more polymeric materials) that encircles the core 22 .
- a sensing system 26 for sensing pressure includes a pair of electrical leads 28 a , 28 b and a plurality of pressure sensors 30 , each of which is embedded in the cover 24 .
- a sensor being “embedded” in the cover means that the sensor is either entirely contained within the cover, and a sensor being “embedded” in a particular layer or set of layers of the cover means that the sensor is entirely contained within that layer or set of layers.
- the sensing system 26 also includes a processor 32 that processes signals produced by the piezoelectric sensors 30 .
- the core is typically formed of a metallic material, such as steel or cast iron.
- the core can be solid or hollow, and if hollow may include devices that can vary pressure or roll profile.
- the cover 24 can take any form and can be formed of any polymeric and/or elastomeric material recognized by those skilled in this art to be suitable for use with a roll.
- Exemplary materials include natural rubber, synthetic rubbers such as neoprene, styrene-butadiene (SBR), nitrile rubber, chlorosulfonated polyethylene (“CSPE”—also known under the trade name HYPALON), EDPM (the name given to an ethylene-propylene terpolymer formed of ethylene-propylene diene monomer), epoxy, and polyurethane.
- SBR styrene-butadiene
- CSPE chlorosulfonated polyethylene
- EDPM the name given to an ethylene-propylene terpolymer formed of ethylene-propylene diene monomer
- epoxy and polyurethane.
- the cover 24 may also include reinforcing and filler materials, additives, and the like. Exemplary additional materials are discussed in
- the cover 24 will comprise multiple layers.
- the construction of an exemplary roll with multiple layers is described in U.S. Pat. No. 8,346,501 to Pak and U.S. Patent Publication No. 2005/0261115 to Moore, the disclosures of which are hereby incorporated herein in their entirety.
- the sensors 30 of the sensing system 26 can take any shape or form recognized by those skilled in this art as being suitable for detecting pressure, including piezoelectric sensors, optical sensors and the like. Exemplary sensors are discussed in U.S. Pat. No. 5,699,729 to Moschel et al.; U.S. Pat. No. 5,562,027 to Moore; U.S. Pat. No. 6,981,935 to Gustafson; and U.S. Pat. No. 6,429,421 to Meller; and U.S. Patent Publication Nos. 2005/0261115 to Moore and 2006/0248723 to Gustafson, the disclosures of each of which are incorporated herein by reference.
- Piezoelectric sensors can include any device that exhibits piezoelectricity when undergoing changes in pressure, temperature or other physical parameters. “Piezoelectricity” is defined as the generation of electricity or of electrical polarity in dielectric crystals subjected to mechanical or other stress, the magnitude of such electricity or electrical polarity being sufficient to distinguish it from electrical noise.
- Exemplary piezoelectric sensors include piezoelectric sensors formed of piezoelectric ceramic, such as PZT-type lead-zirgonate-titanate, quartz, synthetic quartz, tourmaline, gallium ortho-phosphate, CGG (Ca 3 Ga 2 Ge 4 O 14 ), lithium niobate, lithium tantalite, Rochelle salt, and lithium sulfate-monohydrate.
- the senor material can have a Curie temperature of above 350° F., and in some instances 600° F., which can enable accurate sensing at the temperatures often experienced by rolls in papermaking environments.
- a typical outer dimension of the sensor 30 i.e., length, width, diameter, etc. is between about 2 mm and 20 mm, and a typical thickness of the sensor 30 is between about 0.002 and 0.2 inch.
- the sensors 30 are tile-shaped, i.e., square and flat; however, other shapes of sensors and/or apertures may also be suitable.
- the sensors 30 themselves may be rectangular, circular, annular, triangular, oval, hexagonal, octagonal, or the like.
- the sensors 30 may be solid, or may include an internal or external aperture, (i.e., the aperture may have a closed perimeter, or the aperture may be open-ended, such that the sensor 30 takes a “U” or “C” shape). See, e.g., U.S. Patent Publication No. 2006/0248723 to Gustafson, the disclosure of which is hereby incorporated herein in its entirety.
- the sensors 30 are arranged in a helix having a longitudinal axis that is substantially coincident with the longitudinal axis A of the roll 10 .
- the sensors 30 define most of a single helical coil, but in other embodiments the sensors 30 may define a multiple coils, or may define less than a single coil. Also, in some embodiments multiple sets or strings of sensors 30 may be employed.
- sensors 30 may be configured to detect an operational parameter other than pressure (for example, temperature or moisture) and still be suitable for use in embodiments of the invention.
- industrial rolls may include an accelerometer 42 mounted to the end of the roll 10 to assist in determining the position of the roll 10 .
- the accelerometer 42 may be of conventional construction.
- the accelerometer 42 which may be of typical construction, is configured to detect the magnitude and direction of the acceleration of a moving object with respect to gravity, and can generate a gravity vector based on the magnitude and direction of the acceleration.
- the gravity vector induced by the rotation of the roll 10 changes based on its angular position.
- the gravity vector points down and has a magnitude of 1 G.
- the accelerometer 42 reads zero because the gravity vector is orthogonal to the accelerometer vector.
- the accelerometer 42 is at the 9 o'clock position (shown as 180 degrees in FIG.
- the accelerometer 42 reads ⁇ 1 G, and at 12 o'clock (shown as 270 degrees in FIG. 2 ) it reads zero. Because the accelerometer 42 is mounted tangentially to the longitudinal axis A, any centrifugal forces generated therein by the rotation are not a significant factor.
- the designation “G” refers to the acceleration (both in magnitude and direction) detected by the accelerometer 42 ; those of skill in this art will understand that accelerometer data measures acceleration (measured in units of length/time 2 ), and that “G” is a shorthand for such acceleration, with “1 G” being the acceleration produced by the earth's gravitational field.
- “1 G” is the maximum acceleration measured and “ ⁇ 1 G” is the minimum acceleration (i.e., the acceleration in the direction opposite to that of the “1 G” measurement).
- FIG. 3 schematically illustrates electronics that can be used to monitor the signal produced by the accelerometer 42 .
- An analog to digital converter 50 can be used to convert the signal from a voltage to a digital data stream, which is then provided to the processor 32 . Because the roll 10 is rotating in a circular fashion, the accelerometer signal data follows the rotating gravity vector and is sinusoidal in shape.
- FIG. 4A displays a curve of a sample accelerometer output from a rotating roll, with force (including magnitude and direction) experienced by the accelerometer 42 plotted as a function of roll angle.
- a trigger point generated by an accelerometer has been difficult due to the presence of noise (typically caused by roll vibration) in the accelerometer data signal, which can be sufficient to cause the signal to “trigger” at the wrong time.
- the trigger point were designated as the horizontal axis (i.e., the “0” line of the graph of FIG. 4A , which would correspond to the “3 o'clock” or “0 degree” position of FIG. 2 ) as the curve moves upward (which would correspond to the “6 o'clock” or “90 degree” position of FIG. 2 )
- the system 26 would understand that any accelerometer signal that crossed the horizontal axis would be the trigger point for that location on the roll 10 .
- a first sample from the accelerometer is taken as an initial step (block 100 ).
- the system determines whether the magnitude of the absolute value of the gravity vector produced based on the accelerometer sample data is less than a predetermined pre-trigger level (block 110 —see also FIG. 4B ).
- the pre-trigger level is typically set to differ significantly from the trigger level, at a level that is beyond the typical noise error of the system. Note also that the pre-trigger level corresponds to a pre-trigger angular position that differs significantly from that of the trigger level.
- the loop continues. At some point the magnitude of the absolute value of the gravity vector of the accelerator sample data reaches and rises above the pre-trigger threshold (block 120 and FIG. 4B ). Samples continue to be taken (block 130 ), but the absolute value of the gravity vector is then compared to that of the trigger level (block 140 ), which in the illustrated example is located at the horizontal axis.
- the magnitude of the trigger level differs significantly from that of the pre-trigger level (typically about 0.1 to 0.9 G, and in some embodiments 0.3 G, 0.4 G or 0.50 to 0.7 G, 0.8 G or 0.9 G); also, the angular position corresponding to the trigger level differs significantly from that of the pre-trigger level (typically about 10 to 120 degrees, and in some embodiments 30, 40 or 50 degrees to 90, 100 or 120 degrees). Because initially the magnitude of the gravity vector of the accelerometer data has not reached the trigger level, sampling continues in the trigger loop until the magnitude of the gravity vector of the accelerometer signal reaches the trigger level (block 150 and FIG. 4B ). At this point a trigger has occurred, and sensor data can be gathered and matched with their corresponding sensors/angular positions on the roll.
- the pre-trigger level typically about 0.1 to 0.9 G, and in some embodiments 0.3 G, 0.4 G or 0.50 to 0.7 G, 0.8 G or 0.9 G
- the angular position corresponding to the trigger level differs significantly
- the position of the roll 10 can be found reliably, because the system 26 will trigger at essentially the same point in the cycle repeatedly.
- the trigger can be used to identify the angular position of the roll, which enables the determination of which sensors 30 strung around the roll 10 have provided which data points in a data set.
- the use of significantly different pre-trigger and trigger levels can ensure that the accelerometer 42 is in its desired position (e.g., at the bottom of the rotation for the example shown in FIG. 2 ) for the initiation of data collection, even when some noise is present in the accelerometer data as the roll rotates. This capability can be especially useful in a system configuration reading multiple events per rotation (for example, if a roll is mated with multiple mating structures, such that the roll forms multiple nips).
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Abstract
Description
Claims (19)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/255,734 US9157184B2 (en) | 2013-04-19 | 2014-04-17 | Industrial roll with triggering system for sensors for operational parameters |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201361813767P | 2013-04-19 | 2013-04-19 | |
US14/255,734 US9157184B2 (en) | 2013-04-19 | 2014-04-17 | Industrial roll with triggering system for sensors for operational parameters |
Publications (2)
Publication Number | Publication Date |
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US20140311364A1 US20140311364A1 (en) | 2014-10-23 |
US9157184B2 true US9157184B2 (en) | 2015-10-13 |
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US14/255,734 Active 2034-04-19 US9157184B2 (en) | 2013-04-19 | 2014-04-17 | Industrial roll with triggering system for sensors for operational parameters |
Country Status (10)
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US (1) | US9157184B2 (en) |
EP (1) | EP2986775B1 (en) |
JP (1) | JP6134436B2 (en) |
CN (1) | CN105121738B (en) |
AU (1) | AU2014253970B2 (en) |
BR (1) | BR112015019659A2 (en) |
CA (1) | CA2900299C (en) |
CL (1) | CL2015003067A1 (en) |
MX (1) | MX2015014663A (en) |
WO (1) | WO2014172517A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US20150101424A1 (en) * | 2013-10-16 | 2015-04-16 | Hamm Ag | Device and Procedure to Determine a Size of Contact Representing the Contact State of a Compactor Roller upon the Substrate to be Compacted |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102018210989A1 (en) | 2018-07-04 | 2020-01-09 | Dr. Johannes Heidenhain Gmbh | Measuring device for a spindle or a rotary table |
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2014
- 2014-04-17 AU AU2014253970A patent/AU2014253970B2/en active Active
- 2014-04-17 MX MX2015014663A patent/MX2015014663A/en active IP Right Grant
- 2014-04-17 EP EP14726824.7A patent/EP2986775B1/en active Active
- 2014-04-17 WO PCT/US2014/034446 patent/WO2014172517A1/en active Application Filing
- 2014-04-17 CA CA2900299A patent/CA2900299C/en active Active
- 2014-04-17 JP JP2016506695A patent/JP6134436B2/en active Active
- 2014-04-17 BR BR112015019659A patent/BR112015019659A2/en not_active IP Right Cessation
- 2014-04-17 US US14/255,734 patent/US9157184B2/en active Active
- 2014-04-17 CN CN201480008961.5A patent/CN105121738B/en active Active
-
2015
- 2015-10-16 CL CL2015003067A patent/CL2015003067A1/en unknown
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Also Published As
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JP2016522885A (en) | 2016-08-04 |
US20140311364A1 (en) | 2014-10-23 |
JP6134436B2 (en) | 2017-05-24 |
CA2900299C (en) | 2017-10-24 |
CL2015003067A1 (en) | 2016-11-18 |
BR112015019659A2 (en) | 2017-07-18 |
AU2014253970A1 (en) | 2015-08-13 |
EP2986775B1 (en) | 2018-07-25 |
CN105121738B (en) | 2017-04-26 |
CN105121738A (en) | 2015-12-02 |
EP2986775A1 (en) | 2016-02-24 |
CA2900299A1 (en) | 2014-10-23 |
AU2014253970B2 (en) | 2016-03-03 |
WO2014172517A1 (en) | 2014-10-23 |
MX2015014663A (en) | 2016-06-02 |
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